It also likely traces back to support. In that Microsoft has it, Google doesn't, and Apple... magic? But if you're going to run a competent support org, you n

It also likely traces back to support. In that Microsoft has it, Google doesn't, and Apple... magic? But if you're going to run a competent support org, you need to have high-quality, easily-accessible documentation. Because you're not going to know anything about {insert random thing support ticket is asking about}. And if you've already created those docs for internal use, why not simply make them public?